Warranty Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance —	$ 31,095	$ 37,828	$ 35,400
Accruals for warranty expense, net of adjustments	33,113	24,909	33,504
Settlements made	(29,634)	(31,642)	(31,076)
Balance —	$ 34,574	$ 31,095	$ 37,828